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LibUnicode: Parse and generate case folding code point data

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Case folding rules have a similar mapping style as special casing rules,
where one code point may map to zero or more case folding rules. These
will be used for case-insensitive string comparisons. To see how case
folding can differ from other casing rules, consider "ß" (U+00DF):

    >>> "ß".lower()
    'ß'

    >>> "ß".upper()
    'SS'

    >>> "ß".title()
    'Ss'

    >>> "ß".casefold()
    'ss'
This commit is contained in:
Timothy Flynn 2023-01-17 08:34:38 -05:00 • committed by Linus Groh
parent 9226cf7272
commit 8f2589b3b0
7 changed files with 207 additions and 5 deletions
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Userland/Libraries/LibUnicode/UnicodeUtils.h
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@ -17,5 +17,6 @@ namespace Unicode::Detail {
ErrorOr<void> build_lowercase_string(Utf8View code_points, StringBuilder& builder, Optional<StringView> const& locale);
ErrorOr<void> build_uppercase_string(Utf8View code_points, StringBuilder& builder, Optional<StringView> const& locale);
ErrorOr<void> build_titlecase_string(Utf8View code_points, StringBuilder& builder, Optional<StringView> const& locale);
ErrorOr<void> build_casefold_string(Utf8View code_points, StringBuilder& builder);
}